2 isotopes of copper that occur naturally; 63Cu and 65Cu. The 63Cu atoms have a mass of 62.929601 amu and the 65Cu atoms have a mass of 64.927794 amu. What is the percent natural abundance for each isotope?

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you need to have a picture of the atom that way we can answer it

the correct answer would be b) volume versus temperature, because they are also directly proportional.